fix Issue 1175 - nested class inheritance

[CyberShadow]

A simple change - however, I'm not well-versed in DMD internals, so please check this before merging.

[ghost]

It's interesting that this works ok with static classes:

class Foo
{
    static class FooNest { }
}

class Bar : Foo
{
    class BaseNest : FooNest { }
}

I think I've used this once as a workaround for this bug.

[braddr]

This pull broke the master builds, and also didn't pass the tests before it was pulled.. silly Walter, why'd you merge it?

[CyberShadow]

Sorry about this, I'll see if I can get this sorted out.

Brad, would it be possible to add a text file with instructions on how to run the test suite, especially on Windows? It's unclear which file you run (the shell script or the makefile), and what environment you need (Cygwin/etc.)

Looking at autotester logs, I guess the test suite keeps going even after a failed test? That would be why I missed the test failure. Interpreting the output should be in the file with instructions as well.

[JakobOvrum]

To be fair, the autotester isn't that easy to figure out and pretty hard to find, too.

[CyberShadow]

Ah, I see that Kenji beat me to it (pull #893). Thanks!